(maint) No longer install json gem for future parser acceptance runs

Source based acceptance test runs with --parser future were installing
json gem do to binder requirements, but as much of the binder has been
removed, json is no longer needed.
(maint) Acceptance test selector tests for a string rather than a type

Bare upper case words are types in the future parser, so this test
fails because $operatingsystem returns a string which gets compared to
the Resource[Fedora] type.  Explicity quoting so it's clear what the
intention is in the current parser and so that it works properly with
the future parser.
Merge branch 'maint/master/future-parser-acceptance-fixes'

* maint/master/future-parser-acceptance-fixes:
  (maint) Acceptance test selector tests for a string rather than a type
  (maint) No longer install json gem for future parser acceptance runs